oath

1. N-COUNT An oath is a formal promise, especially a promise to be loyal to a person or country. (尤指忠于某人或国家的) 誓言; 宣誓

He took an oath of loyalty to the government. 他做了效忠于政府的宣誓。

2. N-SING In a court of law, when someone takes the oath, they make a formal promise to tell the truth. You can say that someone is under oath when they have made this promise. (在法庭上的) 宣誓['the' N, also 'on/under' N]

His girlfriend had gone into the witness box and taken the oath. 他的女朋友已进了证人席并宣了誓。

Under oath, Andy finally admitted that he had lied. 宣誓之后，安迪终于承认他曾撒了谎。